Speed-indicator.



We. MM MMVM DAHL & M. MARTiN.

SPEED INDICATOR.

APPLIOATIQN FILED NOV. 9, 1906.

Patented July 20, 1909.

2 SHEETS-SHEET 1.

H. DAHL & M. MARTIN. SPEED INDICATOR. APPLICATION FILED NOY. 9, 1906.

928,635. Patented July 20, 1909. 7 F I G- 2 2 SHEETS-SHEET 2.

F I G. i

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SW MW 01M UNITED STATES P TE T ornron HANS DAHL AND MAX MARTIN, orBERLIN, GERMANY; SA'ID MARTIN nAH-L.

ASSIGNOR To sAm srnnn-mmosmon.

No. ceases.

Specification of Letters Patuaint.

Patented July 20, 1 9.09.

The interval of .timeis determined by a,

clockwork or the like.

Through the rotary motion of the shaft or other body whose speed is tobe indicated .a loosely mounted ratchet wheel is arrested by suitablemeans, however, the planet gears transmit their motion to a .secondratchet wheel, which makes the same angular motion and rotates anotherratchet Wheel'provided with a pointer. The two last ratchet wheels arereleased in succession, for instance by a olockwork or the like, and arethereupon re-' tracted b controlling springs. The release of the wheelstakes place in succession, so that .the :pointer wheel has alreadyassumed its osition before the other wheel is released;

may turn still farther forward. With increasing speed the-angiilarvelocity in the given interval of time is greater-than before, and thedevices turn through agreater angle.

The increasing extents of turning are indi.-'

cated by a further throw of the ointer. With decreasing s eed theangular ve ocity is smaller and there ore the extent of turning .of theratchet wheel will also be smaller than the previous extent. The ratchetwheel thus no longer reaches the pointer wheel and the latter isretracted on release, returning to the first wheel. The ointer wheel cannot pass the ratchet whee and therefore assumes the position determinedby the said ratchet Wheel. I This latter, on the other hand returns ateach time of release into the zero osition and is thus on each occasionbroug t anew from zero into itsformer or into a new angular position. ofthe shaft is interrupted both wheels return into their initial position.

Our invention consists essentially in the If the motion.

combination of planet gear with ratchet wheels for setting the pointer,said Wheels ,beinginfiuenced temporarily by the speed to beindicated andthen released.

One form of construction of the new apparatus is illustrated in. theaccompanying drawings in whicl r Figure 1 is-a-sideelevation the.casingbein shown in section Fig. 2 a rear elevationan part section online any .of Fig. 1. Fig. 3 shows .a-dettail of a ratchet wheel andspiral spring to be hereinafter referred to; .Fig. 4 is a frontelevation of the entire instrument,

drawn on asmaller scale.

C is arigid shaft on which the ratchet wheels, gears and other devicesare loosely mounted. On, the-shaft I whose speedis to be indicated andwhich is driven by the strap L there is mounted the bevel gear A, adjacent to which is loosely mounted the ratchet wheel E. In the latter aremounted two planet gears B B 1)} J9 being their bosses, said earsmeshing with the bevel gear A. On .t e shaft -C there is likewise looselmounteda bevel ear .1), .the boss of whic connectsdt with .t e ratchetwheel H. The latter is'furnished ononeside with a etc a, whichstrikes'the'pin m or the like, fixed to the vframework,and on the otherside with a upon by a s iral spring M, which isso ar- I ranged as toeiwoundup .onadvance of-the wheel, 1 ig. 3; Adjacent to this ratchetwheel H is .a ratchet wheel K Which is .con-. trolled by the spiralspring N andiis coupled =withithe pointer Z, which lILltSZGIO ositionlies against the pin 1? of the scale dis S;

' T is a cam cylinder rotated by a time measuring device, such forinstance as an ordinary clockworkior the like, here represented by thefra ment of a gear V. 011 the rim of the disk T there he the ends 0 O Oof the levers Rf R R which at a given time are set in operation bythecams on the cylinder. Hereupon the pawl end a of the sprin actuatedlever R engages the ratchet wheel ll and arrests it so long as the camacts.

' The awl ends n n of the sprin actuated levers K and H respectively andhold them, but the wheels are released on the cams of the disk T liftingthe lever ends 0 O. The indicator Z moves over. the scale on the disk S.

The 0 eration of the apgiratus' is as follows he bevel gears A mesh withthe 2 R engage with the rate et wheels planet gears B B which can rotateon their axes and simultaneously turn with the ratchet wheel E. Owing tothe latter being mounted loosely on the shaft 0, the gear D and theratchet wheel H will remain stationary and the projection a merely restsagainst the pin m, and thel'projection h againstthe projection 7c of theratchet wheel K. The pointer Z is in the zero osition. The two ratchetwheels K H are he (1 by the pawl ends a n of the levers R R ,'while theratchet wheel E is not engaged by the'pawl end n of the lever R Theclockwork drives the cylinder T, and when thecams of the cylin der comeunder the lever end 0 of lever B the pawl end n of this lever will engac with the ratchet wheel E and prevent its urther rotation. Thetwoplanet gears B B now transmit the motion of the wheel A to the gearD. The latter is thus rotated, together with the ratchet wheel H, whichturns freely below the pawl end a of the lever R The projection hengaging with the rojection 7c on the ratchet wheel K, the atter isrotated in the same direction as the wheel H and with the same angularvelocity. The ratchet wheel K turns unobstructed by the .pawl end n ofthe lever R The camsv of the cylinder T now lift the lever ends 0 O insuccession, and thus retract the awl ends 12, n of the levers R R from te ratchet wheels K H, the ratchet Wheel E having been already releasedby the pawl end a. The ratchet wheels K H are then retracted piy theirrespective springs N M.. The wheel can only return so far as the in h ofthe wheel H allows; while the whee H returns each time into the zeroposition. After these positions have been assumed the action of-the gearwheel A commences anew. According to the speed within the definite1ntervalsof time, corresponding to the length of the cams of thecylinder T, the wheels are caused to, turn through a larger or smallerangle, and this willbe larger the greater the speed to be indicated.With increasing I speed the extent of rotation of the ratchet wheels H Kand 'plointer Z will continually increase, while wit decreasing speedthe extent of rotation will always become smaller.

not reach the projection k, so that the wheel K always recedesmore andmore, approaching the zero position:

For this a paratus it is not'necessary that the vehicle, s aft or thelike whose s eed is to be indicated move at a high spee on the contrarythe device will 0 crate even at a very low speed of the vehic e or thelike.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is I S eed indicating apparatus, comprising incom nnation, a shaft and a bevel gear rotated by the body whose s eed isto be indicated; a rigid shaft; a rate et wheel loosely mounted on therigid shaft, and planet gears mounted in theratchet wheel and meshingwith the said bevel gear; a second bevel gear loosely mounted on therigid shaft and meshing with the lanet gears; a spring controlledratchet whee rigidly connected with the second said bevel gear; a springcontrolled, ratchet wheel loosely mounted on the rigid shaft andprovided with a pointer and actuated and controlled by the said secondratchet wheel; sring actuated awls adapted to engage Wit the three sairatchet wheels; and means for actuating the pawls in succession;substantially as described.

In witness whereof we have hereunto signed our names this twenty seventhday of October 1906, in the presence of two subscribing witnesses.

- HANS DAHL.

MAX MARTIN.

Witnesses WOLDEMAR HAUPT, HENRY HASPER.

